Allow using .cfi_startproc without a leading symbol.

This is possible now that we don't produce .eh symbols. This fixes pr19430.

llvm-svn: 211502

2 files changed, 2 insertions, 10 deletions

diff --git a/llvm/lib/MC/MCDwarf.cpp b/llvm/lib/MC/MCDwarf.cpp
index 8f348528cbb..bddbf578d80 100644
--- a/llvm/lib/MC/MCDwarf.cpp
+++ b/llvm/lib/MC/MCDwarf.cpp
@@ -1297,7 +1297,7 @@ void FrameEmitterImpl::EmitCompactUnwind(MCStreamer &Streamer,
   unsigned FDEEncoding = MOFI->getFDEEncoding();
   unsigned Size = getSizeForEncoding(Streamer, FDEEncoding);
   if (VerboseAsm) Streamer.AddComment("Range Start");
-  Streamer.EmitSymbolValue(Frame.Function, Size);
+  Streamer.EmitSymbolValue(Frame.Begin, Size);
 
   // Range Length
   const MCExpr *Range = MakeStartMinusEndExpr(Streamer, *Frame.Begin,
diff --git a/llvm/lib/MC/MCStreamer.cpp b/llvm/lib/MC/MCStreamer.cpp
index 7dccf0d751d..1b3b2decf35 100644
--- a/llvm/lib/MC/MCStreamer.cpp
+++ b/llvm/lib/MC/MCStreamer.cpp
@@ -37,7 +37,7 @@ void MCTargetStreamer::finish() {}
 void MCTargetStreamer::emitAssignment(MCSymbol *Symbol, const MCExpr *Value) {}
 
 MCStreamer::MCStreamer(MCContext &Ctx)
-    : Context(Ctx), CurrentW64UnwindInfo(nullptr), LastSymbol(nullptr) {
+    : Context(Ctx), CurrentW64UnwindInfo(nullptr) {
   SectionStack.push_back(std::pair<MCSectionSubPair, MCSectionSubPair>());
 }
 
@@ -51,7 +51,6 @@ void MCStreamer::reset() {
     delete W64UnwindInfos[i];
   W64UnwindInfos.clear();
   CurrentW64UnwindInfo = nullptr;
-  LastSymbol = nullptr;
   SectionStack.clear();
   SectionStack.push_back(std::pair<MCSectionSubPair, MCSectionSubPair>());
 }
@@ -234,7 +233,6 @@ void MCStreamer::EmitLabel(MCSymbol *Symbol) {
   assert(!Symbol->isVariable() && "Cannot emit a variable symbol!");
   assert(getCurrentSection().first && "Cannot emit before setting section!");
   AssignSection(Symbol, getCurrentSection().first);
-  LastSymbol = Symbol;
 
   MCTargetStreamer *TS = getTargetStreamer();
   if (TS)
@@ -245,7 +243,6 @@ void MCStreamer::EmitDebugLabel(MCSymbol *Symbol) {
   assert(!Symbol->isVariable() && "Cannot emit a variable symbol!");
   assert(getCurrentSection().first && "Cannot emit before setting section!");
   AssignSection(Symbol, getCurrentSection().first);
-  LastSymbol = Symbol;
 }
 
 void MCStreamer::EmitCompactUnwindEncoding(uint32_t CompactUnwindEncoding) {
@@ -274,11 +271,6 @@ void MCStreamer::EmitCFIStartProcImpl(MCDwarfFrameInfo &Frame) {
 }
 
 void MCStreamer::RecordProcStart(MCDwarfFrameInfo &Frame) {
-  // Report an error if we haven't seen a symbol yet where we'd bind
-  // .cfi_startproc.
-  if (!LastSymbol)
-    report_fatal_error("No symbol to start a frame");
-  Frame.Function = LastSymbol;
   // We need to create a local symbol to avoid relocations.
   Frame.Begin = getContext().CreateTempSymbol();
   EmitLabel(Frame.Begin);